Process of purifying rosin.



-' ledo, in the county of Lucas and State of l dead timber of resinous woods, the

. flames which burned the outside of the tim- .rosin, impairing its color and lowering its UNITED STATES PATENT OFFICE.

HOMER T. YARYAN,

0F TOLEDO, OHIO.

PROCESS OF PURIFYING ROSIN.

To all whom it may concern:

Be it known that I, HOMER T. YARYAN, a citizen of the United States, residing at To- I l Ohio, have invented a certain new and useful Process for Purifying Resin; and I do declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to which it ap ertains to use the same.

en rosin is extracted from stumps and roduct has im urities and is of objectionab e color, which lbwer the grade of the rosin and lessen its value. This is due, lar ely, t0 the fact that these woods have usual y been swept by bcr. There a pears to be a zone, lying next to the charre wood, containing rosin which is aifected' by the heat, thus forming apitch and converting some of the abietic aoi into colo honic acid. In the treatment 'of these WOOES with a hydrocarbon solvent for the purpose of recovering the rosin, the solvent is'solves these objectionable impurities whlch now mix with and remain in the recovered grade. After the rosin has become discolored by the resence of these ob'ectionable substances it has heretofore been ound com mercially impracticable to purify the rosin and to give it the desired color.

My invention relates to and its object is to provide a recess for overcomin the objections and ifiiculties'herepointe out and by means of which the impurities in rosin Specification of Letters Patent.

Application flied September 30, 1908. Serial No. 455,459.

may be eliminated.

Patented March 16, 1909.

In racticin my process, I dissolve the rosin in about our parts of hydrocarbon solvent. This solution is treated by agitation with sulfuric acid of about sixty-six per cent. strength. After decanting I again treat the solution with an acid of eighty per cent. strength until the required color is obtained. N0 stated quantity of acid can be named as diflerent rosins require various quantities.

After again decanting the solution, I thoroughly wash it with pure Water to remove any remaining trace of acid and then evaporate the solvent in the usual or any preferred manner to recover the rosin.

I do not confine my invention to the puri- HOMER T. YARYAN.

Witnesses:

CLAYTON MURPHY, ADA E. CAMERON. 

